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Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
General Discussion of Pension and Other Postretirement Benefits [Abstract] |  |  |
Total expense under employee benefit plans | $ 3.1 | $ 2.3 | $ 2.1
Company contributions | 0.3 | 0.3 | 0.3
Liability under the defined benefit plans | $ 4.0 | $ 2.9 |

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